KMA199E T/R NXP Semiconductors, KMA199E T/R Datasheet - Page 18

• Manufacturer Part Number: KMA199E T/R
• Manufacturer: NXP Semiconductors

Specifications of KMA199E T/R

• Operating Temperature (min): -40C
• Operating Supply Voltage (typ): 5V
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
KMA199E_1
Product data sheet
13.3.3 Entering the command mode
13.4 Cyclic redundancy check
After a power-on reset, the sensor provides a time slot t
mode. For this purpose a specific command sequence has to be sent (see
Without entering the command mode, the sensor starts in normal operation mode.
However the signature can always be written by the master, if the sensor switches into
diagnostic mode.
During the command mode sequence, the analog output is enabled, hence the external
programming hardware has to overdrive the output with the current I
mode is activated, the analog output will be disabled and the pin OUT/DIGINT works as a
digital interface.
As already mentioned in
order to calculate this value, a CRC has to be generated with the MSB of the EEPROM
data word at first over all corresponding addresses in increasing order.
For calculating the checksum, all addresses from 0h to Fh have to be read out and
consulted. The Least Significant Byte (LSB) of address Fh, which contains the previous
checksum, must be overwritten with 0h before the calculation can be started.
Finally the internal charge pump has to be enabled for programming by setting the bits
EEP_CP_CLOCK_EN and EEP_WRITE_EN (see
The generator polynomial for the calculation of the checksum is:
With a start value of FFh and the data bits are XOR at x
G x ( )
Fig 15. OWI command mode procedure
=
x
8
+
x
2
OWI
V
+ +
DD
x
1
Rev. 01 — 18 October 2007
Section
START
6, there is an 8-bit checksum of the EEPROM data. In
command
94h
t
cmd(ent)
9Bh
signature
Table
A4h
cmd(ent)
8
16) and waiting for t
point.
Programmable angle sensor
STOP
for entering the command
od
KMA199E
001aag819
. If the command
© NXP B.V. 2007. All rights reserved.
Figure
cp
.
15).
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